A sewer sometimes gives strange signals, and then you wonder: is it time for an inspection of the sewer structure? These types of inspections are a smart choice if you are suffering from recurring blockages, odor problems, or subsidence in the sewer system. Before you decide to have an investigation carried out, look at the age, material, and construction of the current sewerage.
If your sewer keeps getting clogged or the water isn't draining properly, it is wise to check for structural defects in the pipes. You should also not ignore rotting manholes, cracks, and root intrusion. These types of problems are typical reasons to seriously consider a sewer inspection.
A thorough sewer inspection accurately maps the technical condition and layout of your pipes. This allows you to detect structural problems early and prevent major damage or higher repair costs. A smart analysis when in doubt ultimately saves a lot of money and frustration. This enables you to take targeted action, with insight and confidence.
What does a sewer construction investigation entail?
A sewer construction investigation involves thoroughly inspecting and analyzing the condition, operation, and capacity of the existing sewer system. You do this when there are persistent problems such as recurring blockages or subsidence, or when you have doubts about the quality of old pipes. During such an investigation, experts such as sewer technicians and engineers use advanced tools such as camera inspections from the brand Ridgid, smoke tests, and sewer measurements with digital data analysis from companies like Arcadis or Tauw. This allows you to discover problems deep within the pipe system without having to excavate immediately, minimizing unnecessary costs.
When is a sewer structure investigation useful?
You might be wondering when it is really necessary to invest time and money in a sewer inspection. There are situations where this inspection can provide a great deal of insight and prevent future damage:
- Persistent or recurring blockagesWith blockages that keep recurring despite repeated unblocking, you often discover underlying structural defects or root growth. Rediscovering the issue through inspection is key.
- Odour nuisanceAn unexplained sewer smell in or around the house usually means there is a leak, subsidence, or a disconnected connection. A targeted sewer inspection will uncover the cause.
- Old houses or renovationsFor homes older than thirty years or during major renovations, you can be certain that the installation still meets modern requirements by first conducting a thorough sewer inspection.
- Subsidence in garden, driveway, or streetA sunken sidewalk or garden usually indicates problems with the underground sewer system, for example due to broken or poorly installed pipes.

Especially in densely built urban areas like Rotterdam or Amsterdam, you encounter many old cellars and pipes where investigation is essential to prevent large-scale problems.
What steps and methods exist for sewer inspection?
You start a sewer investigation following a clear approach that has proven itself in practice, applied by engineering firms such as Sweco, among others. You follow these steps:
- Inventory of complaints and location
- Choice of research method (e.g. camera, smoke test, water pressure test)
- Performing a visual inspection with a sewer camera
- Analysis of collected images and data
- Prepare an advisory report including a solution plan and budget
How we work
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Tools such as the IBA analyzer or software from Rioned provide real-time insight into the condition of pipes and map out the exact location of bottlenecks. Leak detection using ultrasonic equipment supports the analysis. This prevents blind excavation work.
Various investigation types for sewer construction
Depending on the problem, you always choose the right type of investigation. You can choose from the following options:
- Camera inspection: With a small camera on a flexible hose, you inspect the inside of pipes and detect damage such as hairline cracks or sagging.
- Smoke testDuring a smoke test, you blow smoke into the piping system. Does smoke come out of the pipework? Then you know where the leak or faulty connection is located.
- Sewage water analysisBy analyzing the wastewater, you know whether unwanted substances are leaking into surface water, for example from agriculture, industry, or households.
- Sampling and pressure testingThis allows you to test the watertightness of pipes and estimate whether a system needs to be replaced or merely repaired.
Together, these techniques provide a complete picture of the current status of a sewer structure.
Process and decision points in sewer construction research
Before you have an investigation carried out by a specialized company such as Ontstoppen.nl, first ask yourself the following questions:
- Are there regularly recurring problems that are not being solved structurally?
- Is a remodeling or renovation project on the horizon involving the sewer system?
- Do you want certainty regarding potential costs in the short and long term?
- Is the existing structure outdated and has it never been professionally inspected before?
Are you unsure after answering this? In that case, engaging an expert for a targeted analysis is always the preferred option. You avoid unexpected expenses and environmental damage, especially with the no cure no pay guarantee and the competitive rate of Ontstoppen.nl.
How do you choose the right sewer inspection for your situation?
The choice depends on your goals and the type of problems. For acute blockages or foul odors, opt immediately for a camera inspection or smoke test. If you want to know whether total replacement is necessary or if only a part needs to be repaired, have an expert perform a sewage analysis and possibly a pressure test. Important factors to consider are the age of the pipes, the type of material (PVC, concrete, cast iron), and the expected load from your household or business.
Would you like to receive expert advice based on your specific situation and know exactly where you stand immediately, with free insight into the potential costs, then request a no-obligation sewer construction survey quote immediately. with our team of Ontstoppen.nl.
Furthermore, if you require transparency regarding the exact rates, view our current overview now via this sewer construction research rates page and discover the fixed rate without surprises.
A professional sewer inspection provides certainty and prevents costly damage. Ontstoppen.nl Works quickly, helps you with planning and analysis, and executes everything according to agreements with clear reports. This way, you know exactly what action is needed and why.
Frequently asked questions
1. How do you know if a sewer inspection is necessary for recurring blockages?
If you regularly experience blockages in your home, for example in the toilet or drains, this may indicate underlying problems with the sewer structure. Often, recurring blockages are a clear sign that there may be subsidence, cracks, or incorrectly installed pipes that are not draining water properly. With specialist investigation, such as a sewer camera inspection by Ontstoppen.nl, you can determine exactly where the problem lies and which structural measures are needed.
Are you unsure if such an inspection is really necessary? If standard drain cleaners or the use of a drain snake only temporarily resolve the problem, chances are a more thorough investigation will help prevent future damage and avoid costly repairs. Would you like to know more about immediate unblocking services for a clogged toilet? Then read on our page about having a toilet unblocked quickly by specialists (unclogging the toilet by a specialist company).
2. What signs should you look for to determine if there is a sewer construction problem?
Certain signs clearly indicate that your sewer system may be faulty. These include foul odors in the house, gurgling sounds in drains, slow water drainage, or noticeable subsidence in your garden above the sewer line. A recurring leak in the same section of the pipe is also an important warning sign.
By not waiting too long with these symptoms and having a professional examination performed in a timely manner, such as via Ontstoppen.nl, you prevent serious water and structural damage to your home. Our team helps you with advanced techniques such as smoke tests or a camera inspection. Curious how a stubborn drain blockage is best resolved? Check out our expertise page (Have a persistent drain blockage resolved professionally).
3. Which investigation methods are most effective for sewer construction problems?
The most commonly used investigation methods when problems with the sewer structure are suspected are camera inspection, smoke tests, and sometimes even ground radar. A camera inspection provides a real-time view of the inside of the sewer, allowing you to quickly detect blockages, breaks, or subsidence. A smoke test introduces smoke into the pipes to make leaks or illegal connections visible.
Camera inspections are popular and proven effective in the Netherlands, especially for old pipes or complex sewer networks. By using these techniques in a targeted manner, you save time, money, and unnecessary excavation. Are you curious about solutions for drainage problems? Read more about professional drainage solutions from Ontstoppen.nl (clogged drain solutions).
4. What are the costs and benefits of an investigation into sewer construction?
The cost of a professional sewer inspection depends on the techniques used and the size of the problem. On average, you can expect to pay several hundred euros, but in return, you get certainty and a clear diagnosis. By having an inspection carried out early, you often prevent much larger expenses, for example, when a small crack or subsidence develops into a significant leak or a more serious structural problem.
If you combine the inspection with immediate repair work, you also save on double call-out charges and unnecessary excavation. It offers both private individuals and businesses. Ontstoppen.nl Transparent pricing and expert advice. Do you want to know what else you can do yourself for a minor blockage without chemicals? Read about it in our handy tips on unclogging toilets without chemical products (unclog toilet without chemicals).
5. When is it appropriate to engage a specialized company such as Ontstoppen.nl Highly recommended?
As soon as you notice that standard drain cleaners do not offer a lasting solution or if you suspect structural defects, it is wise to call in an expert. Specialized companies such as Ontstoppen.nl We have modern equipment, such as sewer cameras and detection systems, to quickly and accurately determine the cause of the problem. You benefit from expert diagnosis, concrete repair recommendations, and an objective report, which is helpful if you want to file an insurance claim.
In many cases, insurance companies even work exclusively with reports from recognized companies. By having a professional investigation carried out, you are assured of a lasting solution without surprises afterwards. Do you need emergency help because your toilet is clogged? Read more about the immediately available emergency service for toilet blockages (clogged toilet call emergency service).









